Created
July 9, 2016 00:24
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| func dispatchOnce(_ predicate: inout Bool, _ block: @noescape () throws -> Void) rethrows { | |
| objc_sync_enter(predicate) | |
| defer { objc_sync_exit(predicate) } | |
| if predicate == false { | |
| defer { predicate = true } | |
| try block() | |
| } | |
| } |
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